[RE-wrenches] Schneider MPPT Nominal Voltage Won't Stick

[Jason Szumlanski]

I forgot to mention, I suspect that the Insight configuration might be
overriding changes I made with the SCP. I'm going to try to change the
nominal voltage with the local Insight interface today.

I still don't understand why the XWs are reporting the fault. Maybe that's
just the way the Xanbus network works - any MPPT can report to the XW that
the DC bus is high.


Jason


On Tue, Jan 13, 2026, 7:29 AM Jason Szumlanski <
jason at floridasolardesigngroup.com> wrote:

> I have a new client with an existing Schneider dual XW Pro system with
> four MPPT 100 and two MPPT 60 charge controllers. They have a SCP, AGS, and
> Insight.
>
> The system is reporting DC over voltage faults on the two inverters
> (viewable via SCP. The battery voltage is not high. It's a bank of EG4 LL
> batteries that would hit their high battery cutoff well before the XW
> detects a high battery condition.
>
> I went through all of the setting and discovered that the two MPPT 60 were
> set to a nominal voltage of 36V. I fixed that by changing them to 48V and
> cleared the faults and all was well. I did this though the SCP.
>
> By the time I came home, however, the faults returned and the MPPT 60 both
> reverted to 36V nominal.
>
> I'm not sure why the DC over voltage faults are showing up on the XWs, but
> it seems related to the nominal voltage issue on the MPPT 60s.
>
> Any ideas?
>
> Schneider tech support has me wasting time today going for a boat ride to
> the site to put a meter on the battery terminals, when I know it's
> obviously not an actual battery voltage issue. I'm hoping to steer them in
> a different direction.
>
>
> Jason Szumlanski
> Florida Solar Design Group
>
>
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